/*
 * 跨平台的本地存储类
 */ 
localData = { 
    hname : 'axylocalStatus',
    isLocalStorage : window.localStorage ? true : false,
    dataDom : null,

    initDom : function() {
        if (!this.dataDom) {
            try {
                this.dataDom = document.createElement('input');
                this.dataDom.type = 'hidden';
                this.dataDom.style.display = "none";
                this.dataDom.addBehavior('#default#userData');
                document.body.appendChild(this.dataDom);
                var exDate = new Date();
                exDate.setDate(exDate.getDate() + 30);
                this.dataDom.expires = exDate.toUTCString();
            } catch (ex) {
                return false;
            }
        }
        return true;
    },
    setItem : function(key, value) {
        if (this.isLocalStorage) {
            window.localStorage.setItem(key, value);
        } else {
            if (this.initDom()) {
                this.dataDom.load(this.hname);
                this.dataDom.setAttribute(key, value);
                this.dataDom.save(this.hname)
            }
        }
    },
    getItem : function(key) {
        if (this.isLocalStorage) {
            return window.localStorage.getItem(key);
        } else {
            if (this.initDom()) {
                this.dataDom.load(this.hname);
                return this.dataDom.getAttribute(key);
            }
        }
    },
    remove : function(key) {
        if (this.isLocalStorage) {
            localStorage.removeItem(key);
        } else {
            if (this.initDom()) {
                this.dataDom.load(this.hname);
                this.dataDom.removeAttribute(key);
                this.dataDom.save(this.hname)
            }
        }
    }
}
